In the 1950s, the idea spread that the carbonic acid in Coca-Cola killed sperm, the sugar exploded sperm cells and the carbonation of the drink forced the liquid into the vagina. So it became an after-sex douche: Women would shake up a bottle, insert it and let the soda fly.

Barfmaker:In the 1950s, the idea spread that the carbonic acid in Coca-Cola killed sperm, the sugar exploded sperm cells and the carbonation of the drink forced the liquid into the vagina. So it became an after-sex douche: Women would shake up a bottle, insert it and let the soda fly.

clkeagle:I know three women who ended up pregnant while using Nuvaring... is that just anecdotal, or is it a problem contraceptive?

Looks like failure rate is 9% for "typical use", which is pretty close to most bc pills, but much better than the 22% seem in the pull out method advocated above.Iuds and implants have much better success rates, probably because they don't require as much user interaction.